Writing a sequence in terms of n.

1. mtayab1994

584
1. The problem statement, all variables and given/known data

given: Vn+1=Vn*cos(pi/2^(n+2))

2. Relevant equations

Write a sequence Vn in terms of n

3. The attempt at a solution

we substitute n with n-1 and we get:

V(n-1)+1= Vn-1*cos(pi/2^(n-1+2))

Vn=Vn-1*cos(pi/2^(n+1)

Is this correct?

Last edited: Dec 10, 2011
2. SammyS

7,907
Staff Emeritus
Yes: Vn = Vn-1*cos(π/2(n+1)) .

3. mtayab1994

584
Alright it was an extra credit question in class just wanted to make sure if it was correct. Thank you very much.

4. mtayab1994

584
Off topic question, do u know any good latex software i can't used the stuff given in the forums.

5. SammyS

7,907
Staff Emeritus
I mostly use the LaTeX from the Forums.

To check my code I sometimes use mimeTeX online.

Do a search in these Forums.

6. mtayab1994

584
Alright really appreciate it.

8,183

8. mtayab1994

584
Yea i have them, but when i type up something in there and I try putting it up in here it comes up all weird.

9. LCKurtz

8,183
Oh, I didn't understand that's what you wanted to do. What problem are you having using the forum TeX tools for the forum?

10. mtayab1994

584
It's not a 'problem' but sometimes when I want to type something in it doesn't come up how I want it. This is an example with Lyx:

U_{n+1}=V_{n}+U_{n}

11. LCKurtz

8,183
I'm confused. That is an example of what with Lyx?$$U_{n+1}=V_{n}+U_{n}$$ displays OK here with tex tags.

12. mtayab1994

584
Yea i can't get it to come out like that how can i do it?

13. LCKurtz

8,183
You have to enclose tex expressions with tex or itex tags. They are like the  or \$ tags in regular tex. Right click on the expression to see the source.

 Woops, that doesn't show the tags. Start to reply with a quote to the post with the tex and you will see the tex tags. It's like this: [tox]Put your tex here[/tox] and use tex instead of tox. (If I use tex you won't see the tags).

Last edited: Dec 10, 2011
14. mtayab1994

584
$$U_{n+1}=V_{n}+U_{n}$$

alright i got it to work thanx a million!

15. LCKurtz

8,183
Yep. You can use itex for inline and you can preview your posts before you submit them to see it's all OK.